/Engine/Source/Editor/Kismet/Public/BlueprintActionMenuUtils.h
A centralized utility function for constructing the blueprint favorites menu. Takes the palette menu building code and folds in an additional "IsFavorited" filter check.
static void MakeFavoritesMenu ( [FBlueprintActionContext](API\Editor\BlueprintGraph\FBlueprintActionContext) const & Context, [FBlueprintActionMenuBuilder](API\Editor\Kismet\FBlueprintActionMenuBuilder) & MenuOut )